Automatic knife-grinder



(No Model.) I

v O. J. LE ROY.

AUTOMATIC KNIFE GRINDER.

No. 348,753. Patented Sept. 7, 1886..

Nv PETERS PhoIu-Lilhcgmphar, wnm'n wn, D. c.

UNITED STATES PATENT OFFICE.

CHARLES J. LE ROY, OF ST. LOUIS, MISSOURI.

AUTOMATIC KNIFE-GRINDER.

SPECIFICATION forming part of Letters Patent No. 348,753, datedSeptember 7, 1886.

Serial No. 1.,7, ll33. (No model.)

To an whom, it may concern:

Be it known that LGrmRLEs J. LE ROY, of St. Louis, Missouri, have made anew and useful Improvement in Automatic KuifeGriuders, of which thefollowing is a full, clear-,and exact description, reference being hadto the annexed drawings, making part of this specificatiou, in which-Figure l is a plan ofthe improved machine; Fig. 2, a side elevationthereof; Fig. 3, an end elevation thereof, and Fig. 4 a vertical crosssection on the line 4 4 of Fig. 1.

The same letters of reference denote the same parts.

A represents the frame of the machine. The frame consists substantiallyof the bedplate a, supported upon suitable uprights, a (1?. Aslide, B,rests and is adapted to be moved forward and backward upon the bed-platea from end to end thereof. The grinding-wheel O is attached to the shaft0, which in turn is I held and adapted to be rotated in the bearings b bof the slide B.

D represents the main shaft. It is adapted to rotate in the bearings d din the uprights a a It is provided with the pulley d, by means of whichmotion is communicated to the driving shaft, and it is also providedwith the wide pulley d and with the elongated drum (2. E E representbelts leading from the wide pulley (1 around the pulleys F F F Theselast-named pulleys are connected with the feed-shaft G. The middlepulley, F, is a loose pulley. The other pulleys, F F", are fastened tothe feed-shaft. One, E, of the belts is crossed. Therefore thefeed-shaft is rotated according to the position of the belts. If thebelt E is upon the loose pulley, as shown in Figs. 1, 2, the feed-shaftis driven in one direction by the belt E; but if the belts are shifted,so as to throw the belt E onto the loose pulley and the belt E onto thefast pulley F, the feed-shaft is rotated in the opposite direction. Thefeed-shaft is threaded to engage in the nut H, which is attached to theslide B. By means ofthe feed-shaft then the slide 13 is caused totraverse the bed-plate to and fro. Vhen the slide is moved far enough inone direction upon the bed-plate to encounter a projection, 5, upon thebelt-shifter I, the belt-shifter is caused to operate and shift thebelts E E, causing the motion of the slide B to be reversed; and whenthe slide has moved back again in the opposite direction suffibelt-shifter the latter is moved in the opposite direction, and thebelts E E shift accord ingl y.

J represents a belt leading from the elongated drum d, around the pulley0, upon the shaft 0. 3y means of this belt the shaft 0 and thegrinding-pulley O are driven, and as the slide B is shifted to and froupon the bed-plate the belt J is slipped accordingly upon the elongateddrum (1.

K represents the knifeholder. It extends parallel with the bed-plate ofthe machine, and it is capable of being adjusted vertically, and it canalso be inclined toward and from the side ofthe grinding-wheel C. Tothis end the holder is journaled at k 7: to the frame It. moved upwardand downward in the guides 7.? upon the side of the bed-plate a. Theframe is also provided with a rack, 7.1". The rack engages with apinion, I, that is attached to a shaft, L, which, by means of the crankZ, can be rotated in the bearings Z and according to the direction inwhich the shaft L is rotated the frame and knife-holder are raised orlowered. The knife-holder is also provided with the arm k, which extendsdownward from the holder, and at or toward its lower end engages with ascrew, M. This screw passes through the arm is and bears against theframe It. By operating the screw M the knife-holder is caused to turn inthe bearings k k, and to cause the knife that is attached to the holderto be inclined accordingly to the grinding wheel 0. By means of theclamp-screws N N theholder can be clamped in the bearings 7.: k.

An important feature of the improvement is the provision by which thegrinding-wheel O can be set so that its side shall be directly parallelwith the knife being ground, or so that it can be inclined thereto, asvdesired that is, when it is desired to grind a flat bevel thegrinding-wheel O is set so that its outer side comes squarely againstthe knife, as shown in Fig. 1; and when it is desired to grind a concavebevel or surface the grinding-wheel the knifethat is, so that thegrinding-wheel shall stand cornerwise to the knife. To this ciently toencounter the projection of the g is set so that its outer side shallbeinclined to- This frame in turn is adapted to be end the upperportion, B, of the slide, and, being the portion which sustains thegrindingwheel, is pivoted at b in the slide, so that the upper portion,B, can be turned horizontally around upon the lower portion of theslide, and when turned into the desired position the portion B can bymeans of the bolts and nuts '1)", Fig. 1, be clamped to the lowerportion of the slide. The portion B is concentrically slotted at b toprovide for the adjustment named.

An especial advantage is also derived from making the grinding-wheelmovable in the manner described-that is, in place of attaching thegrinding-wheel to the driving-shaft and causing it to traverse the shaftfrom end to end thereof the grinding-wheel is attached to a slide whichmoves forward and backward upon the rigid bed-plate a. The result accruing from this is the grinding-wheel and knife preserve a'fixed relationto each other throughout the rectilinear motion of the grindingwheel. Inthe construction alluded to a difference in the hardness of the knifebeing ground (that is, when a knife is hard and soft in spots) operatesto alter the relation of the grinding-wheel to the knife, so that theknife in consequence is unevenly ground. In the present instance thisdifficulty is overcome in the manner described.

I claim-- 1. The combination, in a knife-grinder, of the grinding-wheelO, the pivoted slide and support B, operated as described, and theknife-holder K, said grinding-wheel being adj ustable to enable itsouter side to be arranged parallel with or to be inclined to the knife,substantially as and for the purpose described.

2. The combinationof the frame A, having the bed-plate a, the slide B,the pivoted upper portion, B, having concentric slots I), the bolts andnuts I), the feed-shaft G, the projections i i, the grinding-wheel O,and the knife-holder K, substantially as described.

3. The combination of the frame A, the main shaft D, the elongated drumd, the belt J, the pulley c, the shaft 0, the grinding-wheel O,

the slide B, having the pivoted upper portion,

B, provided with concentric slots 1), the bolts and nuts b and theknife-holder K, journaled at k, and vertically adjustable and movabletoward and from the grinding-wheel, substantially as described.

4. In a knife-grinding machine, the knifeholder K, made verticallyadjustable, and also adjustable toward and from the side of thegrinding-wheel, in combination with the grinding-wheel O, the pivotedand adjustable slide B,and the shaft G, substantially as described.

5. The combination of a frame, A, the slide B, the shaft 0, the pulleyc, the grinding-wheel O, the knife-holder K, the pulleys d (1*, thepulleys F F F", the belts E E J, the elongated drum (1 the screw-shaftG, and the belt-shifter I, substantially as described.

I CHARLES J. LE ROY. Witnesses:

O. D. MOODY, 0. O. HUNT.

